主变差动保护在一次负相序系统中的应用

Application of Main Tansformer Differential Protection in Primany Negative-Phase Sequence System

结合工作中遇到的情况,深入详细地分析了国内变压器微机保护在一次正相序系统和一次负相序系统中应用时各侧电流的相位关系,并进行了比较,指出只要按变压器本身的接线组别,各侧绕组和TA的二次实际接线方式设置相应控制字,变压器微机差动保护就能正确运行。

Combining the situation met in the work,deeply and detailedly analyzing phase relationship of different sides of current in national transformer microcomputer protection when it is applied to primary positive phase sequence system and primary negative phase sequence system,and making comparision.This paper points out transformer microcomputer differential protection can correctly operae only under the condition of setting related control word according to wiring group of transformer itself,different sides of winding and secondary practical wiring mode of TA.